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Do you have a mobile phone? Back in the mid-1990s there is a good chance you did not. Today? Well, today, there is a good chance you do not have a landline phone, but you certainly have a mobile phone. According to Gartner, one in three people on the planet have a mobile phone, with that number expected to increase to two in three over the span of this decade. What does that mean? Four billion people will have mobile phones by the year 2020.